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Calcula.
a. 4 – [–6 – (–2 + 9 – 4) – 7] + 6
b. (–8 + 7) + [–3 + (–5 – 6)] + (–2 – 4)
c. –10 – 4 – [–10 + 16 – (3 + 2 – 5) + 3 – 2]
d. [–8 – 10 – (–3 + 15 – 2) + (–8 – 13)] + 2
e. 4 – 10 – [(–17 + 20) – 5] + [–4 + (4 – 3 – 5)]